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Apple Health metrics › Wrist Temperature
Wrist Temperature on Apple Watch and iPhone
How your sleeping wrist temperature deviates from your own baseline.
Where to find itHealth app > Browse > Body Measurements > Wrist Temperature
What it is
Wrist temperature during sleep is shown as a change from your baseline, not an absolute temperature. It can reflect illness, cycle phases and environment.
How Apple measures it
Apple Watch Series 8 and later and Ultra read wrist temperature every few seconds during sleep and build a baseline over about five nights.
What's a normal range?
Day-to-day swings are usually within a few tenths of a degree Celsius. Large sustained rises can accompany fever or illness.
What moves it
- Menstrual cycle phase
- Illness and fever
- Room temperature and bedding
- Alcohol
- Watch fit
See Wrist Temperature next to your other vitals
Apple Health keeps this number several taps deep. OnlyVitals puts the metrics you pick, including Wrist Temperature, on a single dashboard so you can read them at a glance. Everything stays on your device.
One screen for the health numbers you care about.
Get OnlyVitals on the App StoreFrequently asked questions
What does wrist temperature tell me?
A deviation from your own baseline. It is useful for spotting illness or cycle patterns, not for diagnosing a fever.
Which Apple Watch models measure wrist temperature?
Series 8 and later, plus Ultra, and it only records while you sleep with sleep tracking on.
Related metrics
- Walking Heart Rate Average
- Heart Rate Recovery
- Heart Rate
- Walking Speed
- Walking + Running Distance
- Walking Step Length
This page is general information, not medical advice. Ranges vary by age, sex, fitness and device. Talk to a clinician about anything that worries you.